If a math fact is considered, for example 3 + 7 = 10. Then the following are also true:

10 - 3 = 7

10 - 7 = 3

Similar relationships exist for subtraction, for example 10 - 3 = 7. Then the following are also true:

3 + 7 = 10

7 + 3 = 10

The reason for this is that we are dealing with an equation. An equation
is balanced or the same on either side of the equals (=) sign. If exactly the
same thing is done to both sides of the equation, it will still be balanced or equal.